Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 517
in this bobbin is hung, by a silk fiber, a little circular concavemirror, to the back of which are attached little magnets ofwatch-spring steel. To adjust it for use, the suspendedmagnets must be set parallel to the coil of wire. For thispurpose it is necessary to have a small controlling magnet,… … Fig. 385. If a beam of light from a lamp in a dark room be thrownupon the mirror and reflected thence to a screen, S, a spot of
Physics
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
